Building units and construction elements – Stair – ladder – scaffold – or similar support
Patent
1990-08-14
1992-10-20
Burke, Wallace R.
Building units and construction elements
Stair, ladder, scaffold, or similar support
Patent
active
D03304302
REFERENCES:
patent: 4415061 (1983-11-01), Meyer
patent: 4867272 (1989-09-01), Troubridge
Jurn Dale W.
Jurn Mark R.
Baynham H.
Burke Wallace R.
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